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  1. 1
    Published 1989
    Zürich : Beer & Co., -1989]
    v. : ill., maps ; 25 cm.
  2. 2
    Z̈urich : Orell F̈ussli & Co.
    v. : ill. ; 24 cm.
  3. 3
    Bern : Das Volkswirtschaftsdepartement,
    v. ; 21 cm.
  4. 4
    Bern : Das Bundesamt,
    v. : ill. ; 22-30 cm.

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